A new approach to cyclic hydroxamic acids: intramolecular cyclization of N-benzyloxy carbamates with carbon nucleophiles
作者:Yuan Liu、Hollie K. Jacobs、Aravamudan S. Gopalan
DOI:10.1016/j.tet.2011.01.073
日期:2011.3
moderate yields. The sulfoneintermediates 3 from this study can be alkylated while the corresponding phosphonates have been shown to undergo HWE reaction. The α,β-unsaturated synthon, 8, prepared by thermal elimination of sulfoxide 3m, undergoes Michael addition with secondary amines. The usefulness of this approach to prepare polydentate chelators has been demonstrated by the synthesis of bis cyclic hydroxamic
Exploiting Carbonyl Groups to Control Intermolecular Rhodium-Catalyzed Alkene and Alkyne Hydroacylation
作者:Thomas J. Coxon、Maitane Fernández、James Barwick-Silk、Alasdair I. McKay、Louisa E. Britton、Andrew S. Weller、Michael C. Willis
DOI:10.1021/jacs.7b05713
日期:2017.7.26
Rh-catalyzed intermolecular alkene and alkynehydroacylation reactions. By using cationic rhodium catalysts incorporating bisphosphine ligands, efficient and selective reactions are achieved for β-amido, β-ester, and β-keto aldehyde substrates, providing a range of synthetically useful 1,3-dicarbonyl products in excellent yields. A correspondingly broad selection of alkenes and alkynes can be employed